A Novel Session Recovery Mechanism for Cluster-based Signaling Architecture for Conferencing in MANETs

Abstract

Mobile Ad hoc NETworks (MANETs) are networks that do not require pre-configuration. Nodes in MANETs are arbitrarily connected with wireless links. Detecting and handling link/node failures is a challenging issue in MANETs. Many solutions have been proposed. However, only a few of them can be directly used at the application layer. Conferencing in MANETs includes a set of 'killer' applications, such as audio/video conferencing, gaming and distancelearning. Signaling is a critical component of conferencing. It handles conference session's initiation, modification and termination. We have recently proposed a cluster-based signaling architecture for conferencing in MANETs. However the architecture does not address the unintentional departures of participants from the conference caused by link and/or node failures. This paper aims at tackling this issue. A novel session recovery mechanism is proposed. It is based on the well known concept of heartbeat. We modeled and partially validated the recovery formalism using Promela/SPIN.

Signaling for Multimedia Conferencing in Stand-Alone Mobile Ad Hoc Networks

“…Whenever a session is established, the heartbeat of the session starts. The heartbeat messages are not shown here but interested readers can refer to [18]. After the session is established, the SUA A may periodically subscribe to the capability of the UA B.…”

“…The last set of experiments is to evaluate the performance of the session failure detection and recovery mechanism. We suggested some principles for timer settings in [18]. The transmission timer Tt should be larger than the Round-Trip Time (RTT) of the SIP message, Th should be larger than n*Tt and the Tr should be less than the conference duration.…”

“…We defined a simple mechanism to detect inactive sessions caused by the unintentional departure of members and supermembers in [18]. The basic idea is that each session in a conference maintains a heartbeat-a periodical exchange of a request and a reply.…”

An overlay network for autonomous information discovery in the post-composition registries of ambient networks

“…To detect the eventual forced departure of the registries, we use the heartbeat scheme proposed in Fu et al (2007). This reference proposes a session recovery mechanism for clusterbased signaling architecture for conferencing in MANETs.…”

An architecture for M2M enabled social networks

“…The gateway requests the configuration data from the SN server if it cannot find that data in the S node. In case of a super-peer failure (a voluntary or involuntary departure), the gateway uses the popular heartbeat mechanism --a recovery mechanism, as proposed in [20].…”